Dust-screen valve.



.V. J. OBRIEN. DUST SCREEN VALVE; LED JUNE 24, I912- BEHEWED JULY 29,1915- l,176,2 3 8; Patented Mar. 21,1916.

APPLICATION Fl 314mm 7 WC]; 057*277.

VINCENT J. OBRIEN, OF DENVER, COLO n-Apo, Assi enor. or ONE-HALE To a. n.

MAGNAN, 01? DENVER, COLORADO.

inner-scanner vanvn.

Application filed June 24, 1912,

. and useful Improvements in Dust-Screen aware, at some-point in the pipe the pipe line and after it becomes obstructed, in order to I the invention, 10

no means for readily. have been devised.

Valves; and I do declare the following to be a-full, clear, and exact description of such as will enable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanymg drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in I dust screen valves, nection with the introductlon of air or other or valves for use in conmotive fluid to pneumatic tools or other machines operated by air. It is important,

particularly in this class of machine, that the air be cleansed 0r screened of all foreign matter, and especially of particles which are suficientlylarge to obstruct the ducts, orifices or ports with which tools of this class are provided. L I The special object of my present invention is to provide means for cleansing screen which has been used to strain out the dust or foreign particles of matter. from the air or other motive fluid employed in work of this kind, Heretofore, so far as I am while screens have been employed line, or conduit, which carries the motive fluid to the tool, cleansing this screen 5 The screen is usually located in apart of containing removable parts,

clean it, the parts of the pipe line where the screen is-located must be taken apart, and in many instances it'becomesnecessary,

where working in mines, to sendthe screen out of the mine for cleaning, thus making the operation very difficult, and, to a very large exte'iit, interfering with the work.

the pipe line,

The object f 0f myimprovement is to readily cleanse the screen of the collected dust, or debris, without removing it from and to this end I construct a valve and apply the screen to the valve piece, which is rotatable, for the purpose I of cutting the air other turning it on, in

be required, this valve Serial no. 705,517. rene ed. Ju1y29, 1915.

of Denver and State Specification of Letters Patent.

being independent of the throttle valve employed in connection with the tool and directly mounted thereon, hence my improved valve device may be located in any desired part of the pipe line leading to the tool and carrying motive fluid for operating the latter. I prefer, however, to locate this valve close to the tool so that the person in charge thereof may have it readily accessible for manipulating purposes.

It will be understood by those familiar with the operation of tools of this character that the motive fluid for various reasons carries more or and where screens are employed they gradually become obstructed to such an exten that the passage of the necessary quantity of motive fluid to the tool is prevented. In this event it is essential to the proper operation of the tool that the screen be cleansed. in my improved construction, in order to accomplish this, it is only necessary to impart apartial rotary movement to the rotatable valve piece, in which event small ducts. with which the valve piece'is provided. are placed in communication with the air of the pipe line at one extremitv, while their opposite extremities lead to the passage throng the valve piece in the rear of the screen. When the valve is in this position. casing in front of the screen for the esca e of the -matter which clogs the screen. In other words. the motive fluid under pressure is introduced into the opening of the valve piece in the rear of the screen and acts upon the latter in the reversedirection from the passage of the air which has been screened-bv the screen, hence this air. moving through-the screen in the reverse direction, readily removes the dirt or debris from tinues the same as if it had never been obstructed. I also make provision in the event of the closure'of the small ducts heretofore mentioned, for cleansing these ducts by passing air through the said ducts in the reverse from the normal there is an opening in the valveless dirt of various kinds,

carries, it through the aforedirection of its small passage, the said ducts during this cleaning operation bemg in communication with to the atmosphere.

Having briefly outlined my improved construction I will proceed to describe the same in detail, reference being made to the accompanying drawing in which is illustrated an embodiment thereof.

In this drawing: Figure 1 is a side elevation of a pneumatic tool equipped with my improvement. Fig. 2 is a section taken on the line 2-2, Fig. 1, shown on a larger scale. Fig. 3 is a similar View showin the screen Fig. 4 1s a similar view showing the screencarrying valve piece in still another position, being that which the valve piece occupies during the operation of automatically cleaning the screen by the passage of air therethrough in a direction the reverse of its normal passage when on its way to the tool. Fig. 5 shows the valve pice in still another position, being that which it occupies when cleaning out the duets with which the valve plece is equlpped. Fig. 6 is a similar section a showing the valve piece in position to cut off the air, or motive fluid, from the tool. Fig. 7 is an exterior view of the screen valve showing the means provided for indicating to the operator when to stop the movement in order to leave the valve piece in the respective positions illustrated in Figs. 2 to 6 inclusive.

The same reference characters indicate the same parts in all the views.

Let the numeral 5- designate a pneumatic tool provided with an inlet pipe, 6, for mo- 'of a handle, 18, purpose. This valve piece is provided with- 66 tive fluid, with'which is connected a conduit, 7, a valve, 8,being located in the conduit, preferably close to the tool whereby the person in charge of the operation of may easily have access thereto for manipulating purposes. This valve, 8, is composed of a casing, '9, and a rotary valve piece, 10, located within the chamber of the casing. As illustrated in the drawing, the opposite extremities of the valve casing are reduced, as shown at 12 and-13. The extremity, 12, is interiorly threaded, as shown at 14, while the extremity 13 is exteriorlythreaded, these threaded extremities being arranged to form suitable connections with the conduit members on opposite sides of the valve. As shown in the drawing, the opening, 16, which is internally threaded,-constitutes the inlet opening, or the opening through which the motive fluid enters the valve casing on its way to the tool, while the opening, 17, is the openingthrough which the motive fluid, passes after leaving the valve casmg.

The valve piece, 10, is operated by means which is exposed for the an opening, 19, which, when the motive fluid passages in the valve casing leading valve piece in a different position.

the screen,

the latter catlon at one extremity the screen, 20, and formed within the solid part of the valve piece, is

Stretched across the inlet end a number of ducts, or small passages, 22,

which, when the valve piece isin position, as shown in Fig. 2 or wherrthe motive fluid 1s passing regularly to the tool, are closed at their outer extremities by the valve casing, and consequently perform no function. However, if it be assumed that the screen, 20, has become clogged with the debris which it vhas strained out of the motive fluid, whereby it becomes necessary to clean out the operator will turn the valve piece 10, to the position shown in Fig. 3, or

toward the right, far enough to bring the forward extremity 23 of the opening 19 through the valve piece into communication with a port, 24, leading to the atmosphere. The ducts, or passages, 22, will then be in communication let opening, 16, of the valve casing, and at their oppositeextremities with the opening 19 of the valve piece in the rear of the screen 20. Furthermore, the forward ex;

tremity, 23, of the valve piece opening 19 will be in communication with the inlet opening 16 of the valve casing, whereby the motive fluid will have free access to the forward extremity 23 of the opening 19 for the purpose of removing, through the port 24 any dirt that may have accumulated in the forward extremity which is not directly attached, and clinging to the screen. Then by a further movement of the valve piece into the position shown in Fig. 4, the forward extremity 23 of the opening 19 will be cut tion witlrthe inlet opening 16 of the valve casing, but the ducts 22 willstill bein communiwith theinlet opening 16 of the valve casing, and at their opposite extremities with opening 19 in the rear ,of the screen. The forward extremity, 23,

at one extremity with the inu of opening 19, and

off from communicathe passage of the motive fluid through the screen, will quickly remove all of the debris therefrom, thus cleaning the screen without removing it from the valve, ordisconnecting any parts of the mechanism. Should it then be desired to cut ofl? the motive fluid entirely from the passage 19, in the valve piece, the movement of the latter will be continued in the same direc tion until it reaches the position shown in Fig. 6. Now, if the ducts, 22, should become wholly or partially stopped, due to their use as heretofore explained, the valve piece may be turned in the reverse direction until it reaches the position shown in Fig. 5, when the ducts 22 are brought into register with small ports 25 in'the valve casing leading to' the atmosphere. The throttle valve 36 of the tool may then be closed to cut ofl the passage'of the motive fluid to the tool, and after filling the conduit and the tool between the valve 8 andthe valve 36, there will be no escape therefor except through the ducts 22 and ports 25, and these ducts may then be thoroughly cleaned, since the motive fluid is passing therethrough in a direction the reverse of its normal passage, when the ducts are in use for the purpose heretofore explained.

In order. to aid the operator in stopping the valve piece in any one of the respective positions disclosed in Figs. 2 to 6 inclusive, it is preferred. to equip the handle of the screen valve with a pointer, 26, (see Fig. 7 while the valve casing is provided with marks, 27 28, and 29, respectively, and stops, 30 and 31. When the pointer is in the position shown by full lines in Fig. 7 or pointing toward the mark 27 the valve piece will be in the position shown in Fig. 2. Now, if it is desired to turn it to the position shown in Fig. 3, the handle, 18, of the valve piece will be turned toward the left, or in the direction indicated by the arrow, until the pointer reaches the mark 28, being one of the positions indicated by dotted lines. Then,if it is desired to move the valve piece to the position shown in Fig.4 for the purpose of introducing the motive fluid under pressure to the rear of the screen for the purpose of removing the debris clinging to the latter, the handle will be turned in .the same direction to bring the pointer to a position in line with the mark 29, being another of thedotted line positions shown in i Fig. 7. And, finally, if it is desired to turn thevalve piece to a position to cut ofl the motive fluid entirely from the opening, 19, the handle will be turned to bring the pointer into engagement with the ,positive stop 30. From this it will be understood that in order to open the valve piece for the passage of motive fluid to the tool, the handle, 18, may be moved in a direction thereverse of the arrow in Fig. 7 until the pointer, 26, again reaches the full line posiextremity be opened to allow the dirt to pass it to the atmosphere in a direct l1ne. from tion. Again. Should it be desired to clean I out the ducts 22, the reverse movement of the handle could be continued until the pointer, 26, engages the positive stop 31 of the valve casing, when the valve piece will be in the position shown in Fig. '5. 1

From the foregoing description, the use and operation of my any case by passing the fluid therethrough in the reverse direction from that which it takes when the accumulation of debris has resulted. It will also be understood that the use of my improved valve is general in charactor, and may be employed in connection with all classes of tools or apparatus where the screening of fluids may become necessary or desirable.

In order to clean the screen or mesh diaphragm' without the employment of the ducts 22 or the port-24, the valve piece 10 may be given a half rotation whereby the screen 20 will be located adjacent the exit of the valve casing whereby the fluid in passing through the opening 19v of the valve piece will act upon the screen in a direction the reverse of that which it traveled during the clogging of the screen. In this event the dirt will be removed from the screen and carried to the inlet pipe 6 which is provided with an outlet port controlled by a valve 32. This valve is normally closed, butwhen it is desired to clean the screen in the manner just explained it would through the conduit 7, the dirt passing transversely through .the inlet 6 and thus avoiding 1ts entrance to the machine. It is preferable to make the outlet port controlled by the valve 32 somewhat larger than the opening through the conduit on the opposite s de ofthe inlet 6 to facilitate perfect freedom in the escape of the dirt which has been removed from the screen. In cleaning the screen in this manner an opportunity is also given for removing any debris which may have accumulated in the conduit between the valve 8 and the inlet 6.

When employing the valve 32 for the escape of the dire-whereby the valve piece 10 is given a one-half rotation, the stops 30 and 31 would not be employed since 1t wouldv be necessary to give the valve piece a greater degree of movement than is permitted by the said stops. It will thus be understood that I am in no way limited to the details of constructionherein described and illustrated in the drawing, as I am Lib aware that many modifications may be employed without departing from the spirit of the invention as set forth in the appended claims.

Having thus described my invention, what I claim is:

1. The combinationwith means containing a passage for fluid, of a movable valve piece located in said passage and provided with an opening adapted to register with said passage, the valve piece having a mesh diaphragm extending across its said opening and being provided with a duct leading from its outer surface to said opening, its inner extremity communicationg with the opening on the outlet side of the diaphragm, the wall of the fluid passage having a port, the outer extremity of said duct being closed by the wall of the passage when the valve piece is in one of the positions when its opening is in communication with the fluid passage on both sides of the valve piece, the valve piece being movable to bring theouter extremity of sa1d duct into communication with said port, while the valve piece opening is still in communication with the fluid passage for the purpose set forth.

2. In a strainer valve for fluid pipes, a valve seat, a valve piece having a passage therethrough, a mesh diaphragm mounted across said passage, said valve piece having a duct therethrough adapted, when the valve piece is in the proper position, to open communication between the front of the valve and the interior of thevalve piece upon the normally rear side of the diaphragm, said valve seat having an opening therethrough in a position to open communication between the atmosphere and the normally forward side of the diaphragm when the valve piece is in the said position, said valve seat having a'port therethrough adapted when the valve piece is in another position, to register with said duct, said diaphragm being then in substantially the normal position.

3. In combination a fluid pipe, a valve seat, a valve piece rotatable therein, said valve piece having a passage therethrough adapted to be brought into alinement with the bore of said p1pe, a mesh diaphragm mounted across said passage, and set in from the side of the valve piece, said valve seat having a port therethrough leading to the atmosphere, said valve being movable to a position to open communication between the bore of the fluid pipe on the inlet side of the valve piece, and the port in the valve seat diagonally across the forward surface of said diaphragm.

4. In combination a fluid pipe, a valve seat, a valve piece rotatable therein, said valve piece having a passage therethrough adapted to be brought into alinement with the bore of said p1pe,- a mesh diaphragm mounted across and set in from the forward end of sald passage, said valve seat having a port therethrough leading to the atmos-- piece having a passage therethrough for registering with the bore of the pipe on either side, a mesh, diaphragm mounted across said passage, said valve seat having a port extending therethrough, said valve piece having a duct therethrough solocated that when the valve piece is rotated to the proper position, communication will be set up between the bore of the pipe on the inlet side of the valve and the port in the valve seat by way of the duct and passage, the normally forward side of the diaphragm then facing the port, th'e are between the outer end of the duct and the middle of the inlet end of the passage being subtended at the center of the valve piece by an angle less than degrees, whereby the above recited communication is made by turning the valve through less than i; of a revolution from its totally closed toward its open position, or

vice versa.

6. In a strainer valve for fluid pipes, a Valve seat, a rotatable valve piece to fit said seat, said valve piece having a passage therethrough, a mesh diaphragm mounted across said passage, said valve seat having a port extending therethrough, said valve piece.

having a duct therethrough so located that when the valve piece is rotated to the proper position, communication will be set up between the bore of the pipe on the inlet side of the valve and the port in the valve seat by way of the duct and passage, the normally forward side of the diaphragm then facing the port, the inlet end of the duct being located near the diaphragm in that wall of the valve piece which is forward when the valve is closed, the walls of the valve seat being arranged-to cover the duct when the valve is in the fully closed or the fully open position whereby thecommunication above recited occurs at a position of the valve piece intermediate the open and closed positions.

7. In a fluid pipe, a strainer valve comprising a valve seat having an inlet and exit, a rotatable valve piece'to fit said seat, said valve piece having a passage therethrough, a mesh diaphragm mounted across said passage, said valve seat having a port extending therethrough. said valve piece having a duct therethrough, said valve piece being movable to a position to open comprising a valve 15 of the valve and the inlet end of the duct being close to the diaphragm in that wall of the valve piece which is forward when the valve is closed, whereby each of said communications will be set up during the move ment of the valve piece from open to closed position, or vice versa.

8. In a fluid pipe, a strainer valve comseat, a rotatable valve piece to fit said seat, said valve piece having a passage therethrough,

mounted across said passage, said valve seat having a port'extending therethrough, said 'valve piece having a duct therethrough, said valve piece being movable to a position to open communication from said pipe through said duct and diaphragm to said port a mesh diaphragm' and directly from said pipe against said diaphragm to said port. I

9. In a fluid pipe, a strainer valve comprising a valve seat having an inlet and an exit, a rotatable valve piece to fitsaidseat, said valve piece having a passage therethrough, a mesh diaphragm mounted across said passage, said valve seat having a port extending therethrough, said valve piece having a duct therethrough extending from the inside of the passage to a point in that wall of the valve piece which is forward when the valve is closed, the distance between said point and the inlet end of the passage being less than the diameter of the inlet of the valve seat.

In testimony whereof I aifix my signature in presence of two witnesses.

VINCENT J. OBRIEN.

Witnesses:

o A. J. OBRIEN,

MAY CnEMEN'rs. 

